package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;


import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和口味数据
     * @param dishDTO
     */

    @Transactional //事务注解，保证方法是原子性的 要不全部成功，要不全部失败
    public void saveWithFlavor(DishDTO dishDTO){
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

//        向菜品表插入1条数据
        dishMapper.insert(dish);

//        获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
//          向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO){
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    public void deletePatch(List<Long> ids) {
        ///判断当前菜品是否能够删除---是否存在起售状态中的菜品？？
        for (Long id : ids){
           Dish dish = dishMapper.getById(id);
           if(dish.getStatus() == StatusConstant.ENABLE){
//               当前菜品处于起售中，不可以删除(也就是下架了才可以删除)
               throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
           }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        for (Long id : ids) {
////             //删除菜品关联的口味数据
//            dishMapper.deleteByDishId(id);
//        }
        //根据菜品id集合批量删除菜品数据
        //sql: delete from dish where id in (???)
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除口味数据
        //sql: delete from dish_flavor where dish_Id in (???)
        dishFlavorMapper.deleteByDishIds(ids);
    }
    /**
     *根据id查询菜品和对应的口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFavlor(Long id) {
//        根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

//        根据菜品id查询口味数据
        List<DishFlavor> dishFlavors= dishFlavorMapper.getByDishId(id);

//        将查询到的数据封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFavlor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

//        修改菜品基本信息
        dishMapper.update(dish);

//        删除之前的口味 .var快捷获取类型
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

//       重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }
}
